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Astrophotography: 30 seconds at ISO 100 at f/2.8, 5 stop push

This real-world example looks at what one can expect at ISO 100 for a long exposure for astrophotography.

The resulting was dark enough to require a 5 stop push, which is the equivalent of ISO 3200. The main issue with medium format cameras for astrophotography is the lack of fast lenses. The f/2.8 of the Fujifilm GF 63mm f/2.8 was the fastest lens available as of this writing, and yet a 30 second exposure still required a 5 stop push for a fairly bright star field.

Star field, 30 seconds

Adobe Camera Raw 9.9.0.718. 5 stop push. Camera Profile = Camera Pro Neg Hi

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f2.8 @ 30.0 sec, ISO 100; 2017-03-30 21:10:36
GFX 50S + GF63mmF2.8 R WR @ 50mm (63mm)

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